SACRAMENTO, CALIF. ? Once nearly invincible, Marion Jones is becoming more beatable with each event at the U.S. Olympic track trials.

Jones, who won an unprecedented five medals at the 2000 Sydney Games and had talked of trying to match that haul in Athens, could go home empty-handed — if she goes to the Summer Games at all.

She won the 100 four years ago. This time she didn’t qualify. She won the 200 four years ago. She’ll try to qualify in that event starting Friday, but her stamina is in question after she seemed to fade toward the end of the 100.

And she was a bronze medalist in the long jump in 2000. On Monday night, Jones could do no better than seventh in the trials’ qualifying round — in an event in which only one other American has reached the Olympic qualifying standard this year.

The adulation that used to surround her is gone, while suspicions of drug use have clouded her career. In what should be her prime years as an athlete, the 28-year-old Jones now seems to receive as much sympathy as awe.

She never smiled or showed much expression during her three jumps Monday. She never seemed to soar. As in the 100 two days earlier, she seemed to lack an extra gear.

Jones strode across the field after her jumps, hiding under a white cap as she was escorted by a meet official. She ducked under a tent and disappeared under the stands, avoiding the “mixed zone” where reporters awaited her.

She looked like a woman under duress, and there’s ample reason for that.

Four years after being the golden girl of the Sydney Games and a year after triumphantly announcing she was returning to the sport just weeks after giving birth, she is being probed for possible drug use and her performances have plummeted.

“I don’t know what she’s going through right now. I don’t envy her at all with all the distractions that she has out there,” said Grace Upshaw, the only other U.S. long jumper who has met the qualifying standard this season.

“I think she’s a great athlete, and she’s a mom,” Upshaw said Tuesday. “That’s what blows my mind. She had a baby and she’s out here being competitive, and I think that’s awesome.”

Jones’ troubles began in the winter of 2003, when she was a few months pregnant. She and her boyfriend, 100 world record holder Tim Montgomery, had an acrimonious split with coach Trevor Graham and for a short time worked with disgraced coach Charlie Francis — who supplied steroids to Ben Johnson in the 1980s.

After getting pressure from world track officials, Jones and Montgomery severed their ties to Francis. Her reputation seemed intact, especially in the glow of her new motherhood last summer.